Filter element



Aug. 8, 1950 R. N. coLEMAN FILTER ELEMENT 2' Sheets-Sheet 1 Filed Oct. 8, 1945 .m m Z w W W M f Aug. 8, 1950 i R. N. COLEMAN FILTER ELEMENT 2 Sheets-Sheet 2 Filed oot. 8, 1945 Patented Aug. 8, 1950 'Richard-N. ioleman, Broadview, Ill., 'a'ssig'nor to International arvester iGmnpany, a 'corporate -tion of New 'Jersey fenvelo'pe with filtering Wells urged v`cellapiseti "b'y ienlveiepe.

Ahtherr oiijeet the p'fo'visi'on :in fia fiiterin'g ehve'lope, as fieeser'ib'ed in fthefgenerel febijeet twisted fa'n :having :parts there'di `'ti-rekeh :away to YFigui'e 41is fa v.tifafihsverse fs'ectional view -iof 'the lenv'elope :taken fonfthe line 4;:4 ifn Figume 3.

Figura 5 is a fragmentem fsectier-ial'vewtagken through Vthe felded 'or eo'nvolute fien-velep'e :'o'n 'the -Iiine *5 in Figura 11=. i

yFigura 6 :is 2a .fragmentem rp'eirspec'tive 'view IThe lpresert filtering velementi's -b'f 'the ftiiseamdable type, that is, 'the elemehtvis .to be 'used/for fa e 'new element. The 'filtering 'element Alf .is

:shown in 'its =`'cinripleteii :and imstiled :relation end :en'chored i'n ithrezude'dlhoies ii :sege 523 in .the fcesi'ng b'otte'm '211. Thisiiuid enwhich :in one taee'df .its ifebriealtion :is Jong ven'i and 6, filtering sheet or envelope side wall A can be seen to have one part 3| of an edge portion 32 reversely folded at 33 to lie upon or against a part 34 of such edge portion. The edge portion 32 extends lengthwise along an edge EG of the enevelope. At the opposite edge EG' of the envelope 28, an edge portion 35 of the sheet A consists of longitudinally extending parts 36, 31, 38, and 39. The 'part 31 is folded reversely with respect to the part 36 to lie thereagainst, :while the part 38 is folded reversely to lie against the part 31 and the part 39 is folded reversely to lie on the opposite side of the part 36 from the part 31. Holes are provided in .spaced relation length- Wise of the marginal sheet portion 35 in the parts 31 and 38 to form a channel 43 with which port-forming notches 4| communicate. Collectively the marginal parts 31 and 38 provide a spacer element between the sheets A and B and may be regarded as marginal sheet portions having a reversely folded section oreased lengthiwise thereof. The reversely folded section at which the crease occurs is that section at which the parts 31 and 38 are `ioined together and folded relatively to one another.

Sheet B is folded at its edges identically with the folding of sheet A and the corresponding elements of these folded parts are identified by the same respective characters with the addition of a prime. Folded filtering sheets A and B are so arranged that the folded marginal parts 31-38 of the sheet A are disposed between these sheets at one edge, EG', of the envelope and that the marginal parts 31' 38' are disposed between the sheets at the opposite edge, EG. Subsequently to this disposal of the folded sheets they are sewn together by one or more lines of stitching 4'2 extending perimetrically thereabout and with the thread extending through the various parts of the folded marginal 'portions at the line of coincidence therewith.

The sewn envelope is folded along laterally spaced fold lines X and Y extending transversely between the edges EG and EG', the folds being reverse folds in the respect of being in one direction about the lines X and in the opposite direction about the lines Y so as to attain the convoluted arrangement, illustrated in Figures 1,. 5, and 6. In this manner a series of hollow envelope sections S are formed. 180 bends are made in the envelope at the fold lines X and Y, whereby the adjacent ones of the fiat envelope sections S are juxtaposed fiatwise, as illustrated in Figure 5. Subsequent to this folding of the envelope, it may be drilled to form bores 43, Figures 1 and 5, for respe'ctively receiving the tubular casing studs |8. Such drilling of the folded en-velope is done in a manner ffor causing the bores 43 to inte'rsect or communicate with the cut-out sections or notches 4| and 4|' in the envelope wall spacer elements 31-38 and 31'-38'. If desired, niarginal edge portions of the filtering sheets can be preformed with cut-outs or holes 44 which when becoming axially registered in the folded sheets constitute transverse sections of the bore 43 and thereby effect such bore.

Asseinbly of the filtering element I within the casing |2 is ac-:oniplished by telescoping the bores 43 respectively over the upper ends of the tubular studs 8 while the cap nuts 22 and the cover member |1 are removed. After thus inserting the element into the casing onto the tubular studs, the cover |1 is replaced. The inner side of the cover carries filter element compressing devices 45. Each device comprises a tubular member 46 secured to the inner side of the cover member coaxially with a respective one of the openings 2|. This tubular member 43 has a pair of diametrically opposed side wall slots 41 for receiving inwardly turned studs 48 on a tubular slider 49 assembled telescopically with the element 46. A spring 5| reacting between the inner side of the 'cover and the flanged lower end of the slider 49`urges the slider into a'pcsition wherein the studs 48 are in abutment 'with the lower ends of the slots 41. This condition will prevail when the cover member is removed. However, when the cover member is assembled rwith the `oasing, the lower enols of the sliders 48 abut against the upper end of the filter element and zpress against the material about the upper end of the element |bores 43. The material immediately about the lower ends of the bores 43 is abutted by flat surfaces 52 in the bottom of the casing, 'and the springs 5| cause the laminated assembly off the folded marginal edge portions of the filtering sheets to be coinpressed firmly together 'between the casing surfaces 52 and the slider members 49 With sufiicient predetermined pressure for establishing sealing contact between the contiguous surfaces of these laminations. Collectively, therefore, the folded marginal edge 'portions of the filtering sheets being pressed flatwise together form the body of drainage galleries containing the bores 43 land the ports 4| and 4|' communicative directly and individually with the hat envelope Sections S.

Fluid 'within the casing |2 and ambient to the envelope passes inlwardly through the envelope side walls A and B through the ports 4| and 4|' into the bores 43. From these 'bores the filtered fluid reaches the interior of the tubular studs |8 through exterior Channels 53 extending lengthiwise thereof and having a series of holes 54 communicative from the bottom of the channels to the interior of the tubes. If desired, the channels 53 may be dispensed with by making the cut-outs 44 or the drainage gallery bore 43 of greater diameter than the exterior diameter of said tubular members. After entry of the filtered fluid into tubular studs |8, it flows outwardly of the casing through the passages 25, 26, and 21 as explained hereina'bove.

The internal spacer elements formed by the marginal fold parts 31-38 and 31'--38' provide material in :which the ports 4| and 4|' can be formed and also serve to separate the filtering walls A and B adjacently to the entrance to these ports. The exterior parts 3| and 3|' of the marginal edge portions of the sheets serve as spacer members between the adjacent envelope filtering Sections S for increasing the amount of space for the collection of sludge or other solid matter which is separated froim the filtered fiuid. The exterior separating parts 3 I, 3|', 39, and 39' also function to p'revent the filterin'g sheets being folded at such a short radius at the fold lines X andY that may cause injury to the filtering portion of the sheets. Using folded edge portions of the sheets for the building of the laminated body of the dr'ainage gallery eliminates the necessity of handlin'g separate parts which would otherwise need to vbe assembled with the filtering sheets in formation of the laminated gallery structure.

Having thus described a preferred embodiment of the invention 'with the view of concisely and fully illustrating the same, I claim:

1. In a filter for iiuids, a filtering envelope comprising porous fiatwise-contiguous Sheet-like side walls secured together about their perimetric edges and through which fluid is filterable into the envelope from a fluid body ambient thereto, said side walls having marginal edge portions extending along a common edge of such envelope, at least one of said edge portions being folded to form a spacer element disposed between said side walls and extending lengthwise of said envelope edge, said envelope having a series of laterally spaced reverse folds extending transversely of said edge and thereby incurring a series of hallow envelope sections which are juxtaposed fiatwise relatively to adjacent thereof, and means for forming a drainage duet extending through portions of said side walls respectively associated with said envelope hollow sections, said means comprising cut-out-containing portions in said spacer element and respectively communicative with said hollow envelope sections and holecontaining portions in the walls of said sections, said 'hole-containing wall portions and said cutout-containing portions of the spacer element being assembleable in registry axially of said holes to dispose said holes and said cut-outs for constituting transverse sections of said drainage duet.

2. In a filter for fiuids, a filtering envelope comprising porous fiatwise-contiguous Sheet-like walls secured together about their edges and through which fluid is filterable into the envelope from a fluid body ambient thereto, said envelope having a series of laterally-spaced reverse folds extending transversely from an edge thereof and thereby incurring a series of fiat envelope sections of which those adjoining one another are juxtaposed fiatwise, and a channelled drainage gallery for said envelope comprising marginal portions of said sheets extending along said envelope edge, at least one of said marginal sheet portions being folded to lie between said sheets, said. marginal portions having cut-out sections arranged intercommunicatively to form respective portions of the channel in said gallery, and the cut-out sections in the one marginal sheet portion communicating with respective envelope sections.

3. In a filter for fluids, a filtering envelope comprising porous flatwise-contiguous Sheet-like walls secured together about their edges and through which fluid is filterable into the envelope from a fluid body ambient thereto, said envelope having a series of laterally-spaced reverse folds extending transversely from an edge thereof and thereby incurring a series of fiat envelope sections of which those adjoining one another are juxtaposed flatwise, and a channelled drainage gallery for said envelope comprising marginal portions of said sheets extending along said envelope edge and of which at least one is folded length- Wise thereof, said marginal portions being compressible flatwise together to form the body of said gallery and 'having cut-outs therein comprising parts of a gallery channel which is directly -communicative with said envelope sections through at least part of said cut-outs.

4. In a filter for fiuids, a filtering envelope comprising porous fiatwise-contiguous Sheet-like walls secured together about their edges and through which fluid is filterable into the envelope from a fluid body ambient thereto, said envelope having a series of laterally-spaced redrainage gallery for said envelope comprising marginal portions of said envelope adjacently to said edge and folded lengthwise thereof in a fashion disposin'g at least part of said portions between said envelope side walls, said marginal portions being compressible flatwise together to form the body of said gallery and having 'cutouts therein comprising parts of a gallery channel which is directly communicative with said envelope sections through at least part of said cut-outs.

5. In a filter for fluids, a filtering envelope eomprising porous flatwise-contiguous sheet-like walls secured together about their edges and through which fluid is filterable into the envelope from a fluid body ambient thereto, said envelope having a series of laterally-spaced reverse folds extending transversely from an edge thereof and thereby incurring a series of fiat envelope sections of which those adjoining one another are juxtaposed flatwise, and a channelled drainage gallery for said envelope comprising marginal portions of said. envelope adjacently to said edge and folded lengthwise thereof in a fashion disposing parts of said marginal portions respectively between and exteriorly of said envelope side walls, said marginal portions being compressible flatwise together to form the body of said gallery and having cut-outs therein comprising parts of a gallery channel which is directly communicative with said envelope sections through at least part of said cut-outs.

6. In a filter for fluids, a filtering envelope 'comprising porous flatwise-contiguous Sheet-like walls secured together about their edges and through which fluid is filterable into the envelope from a fluid body ambient thereto, said envelope having a series of laterally-spaced reverse folds extendin'g transversely from an edge thereof and thereby incurring a series of fiat envelope sections of which those adjoining one another are juxtaposed flatwise, and a channelled drainage gallery for said envelope comprising marginal portions of said sheets extending along said envelope edge, one of said marginal sheet portions having a reversely folded section creased lengthwise thereof disposed between said sheets and a section bent about and disposed exteriorly of the sheet with which it is integral, said reversely folded section having notches therein interiorly communicative with respective of the fiat envelope sections, said marginal Sheet portions being pressable fiatwise together to form the body of said gallery, and said marginal edge portions having holes therein which axially register in said body to form a drainag channel therein extending perpendicularly through the flat envelope sections and communicative therewith through said notches.

RICHARD N. COLEMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,651,400 McKinley Dec. 6, 1927 1546222 McKinley Feb. 4, 1980 2,063,392 McCain Dec. 8, 1936 2,352,300 Walker et al June 27, 1944 2,488,726 Judkins NOV. 22, 1949 FOREIGN PATENTS Number Country Date 16,237 Great Britain Of 1907 292,719 Great Britain June 28, 1928 

